Precast plaster-wall section



April 27 1926. 1,582,721

' w. H. ADAMS PRECAST PLASTER WALL SECTION Filed June 4, 1925 Patented Apr. 27, 1926.

UNITED STATES WILLIAM H. ADAMS, on NEW YORK, N. Y.

PRECAST PLASTER-WALL SECTION.

Application M June 4, 1925. Serial No. 34,995.

To all whom it may concern:

' Be it knpwn that I, WILLIAM H. AnAMs, a citizen of the United States, residing at New York city, N. Y., have invented certain new and useful Improvements in Precast Plasten-Wall Sections, of which'the following is a specification.

This invention relates to improvements in precast plaster wall sections and more particularly to rectangular wall sections made of the usual plastic substances employed inmanufacturing wall boards or the like.

The primary object of the invention is to provide a pre-cast plaster .wall section having a fluted paper reinforcement therein, the edge portions of the paper being flattened out to accommodate reduced edge portions on the sheet or section.

Another object of the invention is to provide rabbets at each side of each of the longitudinal edges of the section to facilitate the attachment of the sections to a wall or ceiling structure and to permit the formation of neat joints where the edges of the sections meet. I

A further .object of the invention is to provide the reduced edges of the section with loose substantially U-shapedbinding strips to protect the raw edges of the sheet during shipment and to prevent cracking of the edge portions during transportation.

With the foregoing objects outlined and with other objects in view which will appear as the description proceeds, the inventionconsists in the novel features hereinafter described in detail, illustrated in the accompanying drawing and more particularly pointed out in' the appended claims.

Referring to the drawing:

Fig. 1 is a horizontal sectional view taken through a wall stud and a portion of two sections in accordance with my invention, and illustrating the manner of forming the joints between the sections.

Fig. 2 is a transverse sectional view of one of the sections showin enlarged and taken on the line 2-2 of Figure 3.

Fig. 3 is a plan view of one of the sections.

Fig. 4 is an edge view of the same.

Fig. 5 is a fragmentary transverse sectional view of an edgeportion of the section with a loose binding strip applied thereto.

Referring first to Figs. 2, 3 and 4, it may be stated that the improved pre-cast plaster wall sections in accordance with. this invention may be manufactured by machines similar to those employed in makingplaster boards. During manufacture, a facing strip 1 of paper or the like is fedalong the table of the machine and the table will be provided with raised portions to form the rabbets 2 at theedge portions of the paper. As the paper moves along a first layer 3 of of gypsum or any similar material of the character used with plaster boards, is de-' posited on the paper sheet 1, and subsequently a sheet of fluted paper or the like 4 is superposed on the plastic layer 3, and if desired pressing means may be employed to cause the plastic material to enter the cavities formed by the flutes in the paper. The edge portions 5 of the sheet 4 are flat to facilitate reducing the ends or side edges of the section.

After the sheet 4 has been properly placed, a second layer 6 of gypsum or the like is deposited on the sheet 4 and this layer may be tamped down to cause the plastic material to enter the cavities in the upper side of the sheet. Afterwards the surface of the layer 6'may be trowelled off to.provide rabbets 7 at the upper side of the section, and finally a surface sheet 8 of paper orv the like may be placed over the layer 6 and its edge portions 9 be bent into the rabbets 7. In this way I obtain a plaster wall section reinforced throughout substantially its entire width; provided with rabbeted edge portions and having raw edges 10 all around. These raw edges enable me to paint the edges of the sections with plaster or the like before they are butted together, or to fill the joints with plaster after they are nailed to the wall, in order to produce a wall or ceiling of solid plaster or other cementitious material, thus deriving the benefit of better fire protection and insulation, also more substantial construction as the walls, and ceiling thus formed will be solid as concerns the basic material.

In securing sections of this character to wall studs or ceiling joists, a strip of suitable material 11 such as paper or the like is placed against the stud or joist 12 and the rabbeted ort-ions at one side of two sheets or sections are placed against the strip 11 as shown in Fig. 1.- Then suitable fastening means such as nails 13 may be passed through the reduced edge portions of the ,two sheets and through the strip 11 into the stud or joist. In'this connection it is l the crevice between the raw edges may be to be noted that the strip 11 functions as a I cushioning medium to prevent fracturing of the sheets and in addition the nails may bend slightly at the points where they pass i through the strip 11, without causing breakfilled with plaster 14: after the sections are nailed: In this way the plaster base will be continuous throughout the room or the like.

It will be observed from Fig. 1 that the I nails 13 pass through the edge portions of the reinforcing sheets 4 and this facilitates retaining the sections in position.

After the sections have been nailed in position, a facing strip 15 is secured in the rabbets 7 by pasting 'or the like, so that the outer surface of the wall or ceiling will have a smooth finished appearance and will be rgpdy to receive paint, wall-paper or the li e. 5

While the rabbets at the opposite edges of the sheets facilitate the formation of the joints they are open to a disadvantage in shipment. If a number of the sections are placed in superposed relation for transportation, vibration may cause the reduced edge portions to eventually crack, and to prevent this I place a U-shaped binding strip 16 loosely over the side edge portion of each section. This binding strip will protect the raw side edges and will enter the rabbets 2 and 7, and the outer surfaces of its flaps 17 will be flush with the outer surfaces of the facing sheets 1 and 8. This is clearly shown in Fig. 5, and it will be appreciated by those skilled in the art that such binding strips will prevent vibration from fracturing the edges of the sections when said sections are in superposed relation during shipment.

From the foregoing it is believed that the construction and advantages of the invention may be readily understood by those versed in the art, and it is obvious that changes may be made in the details disclosed without departing from the spirit of the invention as expressed in the claims.

What I claim and desire to secure by Letters Patent is:

1. A pre-cast plaster wall section comprisrialentirely embedded in said base and having flattened. edge portions embedded with.- in the reduced edge portions of the base.

.2. A pre-cast plaster wall section com prising a plastic composition base having reduced side edge portions with rabbets at' both sides thereof, and a fluted sheet of fibrous material entirely embedded in said base and having straight ed e portions extending into the reduced e ge portions of the base. w

3. A p-re-cast plaster wallv section comprising a plastic composition base havin reduced edge portions and covered on both sides with facing sheets, the facing sheets conforming to the reduced portions of the base and providing rabbets on both sides each side edge portion of the'base.

4. A pre-cast plaster wall section comprising a plastic composition base having rabbets on both sides of each of its side edge portions.

5. pre-cast plaster wall section com prising a plastic composition base having rabbets on both sides of each of its side edge portions, a reinforcing sheet of fibrous material embedded in the base and having portions extending between the rabbeted portions of the base, and facing sheets secured to the opposite sides of the base and extend ing into the rabbeted ortions.

6. In combination, a uilding frame member, a strip of fibrous material'lying against one surface of said member, a plurality of pre-cast plaster wall sections each having rabbeted edge portions, said strip extending into the rabbets at one side of each sheet, fastening elements passing through the edge portions of said sections and through the strip for securing the sect-ions'to said mem- 8. A combination as claimed in claim 6 in which each section is provided with an internal reinforcement through which the fastening elements extend.

In testimony whereof I afiix my signature.

WILLIAM H. ADAMS. 

